It's becoming more regular that AB pages open to the left on screen , and, at the same time, Latest Posts and Subscribed Posts completely disappear from view; along with the Search Box.
Just to say that on occasion I've had a thread open smaller zoom over to the left. Wondering if it's a browser related incompatibility with the webpages here.
I don't think it's my computer because a few weeks ago I bought a Lenovo Laptop as an addition to my Desktop PC and it happens also on the new machine. More likely to be something along the lines of what O_G has suggested.
My default Browsers are Firefox in both machines and they are up-to-date...70.0.1
Interesting what you say Jackdaw. When the pages moves to the left on my machines they are enlarged and, as this happened a minute ago, I scrolled to bottom of page and discovered latest posts and subscribed threads listed there.
@Rosie29....What Browser are you using and is the page somewhat larger when it moves to the left.